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jbd2: add fast commit machinery

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This functions adds necessary APIs needed in JBD2 layer for fast
commits.

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20201015203802.3597742-5-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar 2020-10-15 13:37:56 -07:00 • committed by Theodore Ts'o
parent 6866d7b3f2
commit ff780b91ef
4 changed files with 268 additions and 1 deletions
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44
fs/jbd2/commit.c
View file

@ -206,6 +206,30 @@ int jbd2_journal_submit_inode_data_buffers(struct jbd2_inode *jinode)
return generic_writepages(mapping, &wbc);
}
/* Send all the data buffers related to an inode */
int jbd2_submit_inode_data(struct jbd2_inode *jinode)
{
if (!jinode || !(jinode->i_flags & JI_WRITE_DATA))
return 0;
trace_jbd2_submit_inode_data(jinode->i_vfs_inode);
return jbd2_journal_submit_inode_data_buffers(jinode);
}
EXPORT_SYMBOL(jbd2_submit_inode_data);
int jbd2_wait_inode_data(journal_t *journal, struct jbd2_inode *jinode)
{
if (!jinode || !(jinode->i_flags & JI_WAIT_DATA) ||
!jinode->i_vfs_inode || !jinode->i_vfs_inode->i_mapping)
return 0;
return filemap_fdatawait_range_keep_errors(
jinode->i_vfs_inode->i_mapping, jinode->i_dirty_start,
jinode->i_dirty_end);
}
EXPORT_SYMBOL(jbd2_wait_inode_data);
/*
* Submit all the data buffers of inode associated with the transaction to
* disk.
@ -415,6 +439,20 @@ void jbd2_journal_commit_transaction(journal_t *journal)
J_ASSERT(journal->j_running_transaction != NULL);
J_ASSERT(journal->j_committing_transaction == NULL);
write_lock(&journal->j_state_lock);
journal->j_flags |= JBD2_FULL_COMMIT_ONGOING;
while (journal->j_flags & JBD2_FAST_COMMIT_ONGOING) {
DEFINE_WAIT(wait);
prepare_to_wait(&journal->j_fc_wait, &wait,
TASK_UNINTERRUPTIBLE);
write_unlock(&journal->j_state_lock);
schedule();
write_lock(&journal->j_state_lock);
finish_wait(&journal->j_fc_wait, &wait);
}
write_unlock(&journal->j_state_lock);
commit_transaction = journal->j_running_transaction;
trace_jbd2_start_commit(journal, commit_transaction);
@ -422,6 +460,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
commit_transaction->t_tid);
write_lock(&journal->j_state_lock);
journal->j_fc_off = 0;
J_ASSERT(commit_transaction->t_state == T_RUNNING);
commit_transaction->t_state = T_LOCKED;
@ -1121,12 +1160,16 @@ restart_loop:
if (journal->j_commit_callback)
journal->j_commit_callback(journal, commit_transaction);
if (journal->j_fc_cleanup_callback)
journal->j_fc_cleanup_callback(journal, 1);
trace_jbd2_end_commit(journal, commit_transaction);
jbd_debug(1, "JBD2: commit %d complete, head %d\n",
journal->j_commit_sequence, journal->j_tail_sequence);
write_lock(&journal->j_state_lock);
journal->j_flags &= ~JBD2_FULL_COMMIT_ONGOING;
journal->j_flags &= ~JBD2_FAST_COMMIT_ONGOING;
spin_lock(&journal->j_list_lock);
commit_transaction->t_state = T_FINISHED;
/* Check if the transaction can be dropped now that we are finished */
@ -1138,6 +1181,7 @@ restart_loop:
spin_unlock(&journal->j_list_lock);
write_unlock(&journal->j_state_lock);
wake_up(&journal->j_wait_done_commit);
wake_up(&journal->j_fc_wait);
/*
* Calculate overall stats